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Spring Equinox – Vernal Equinox

The Vernal (Spring) Equinox in the Northern Hemisphere is the Autumnal (Fall) Equinox in the Southern Hemisphere and vice versa.

Equinox and solstice illustration.

Equinoxes and solstices happen twice a year.

Equinoxes and Solstices are opposite on either side of the equator. (Ill. not to scale)

Not Entirely Equal Day & Night

On the equinoxes the Sun shines directly on the equator and the length of day and night is nearly equal – but not quite.

The March equinox marks the moment the Sun crosses the celestial equator – the imaginary line in the sky above the Earth’s equator – from south to north and vice versa in September.

When is the Equinox in my City?

Vernal Equinox – Northern Hemisphere

(USA, Central America, Canada, Europe, Asia, northern Africa)

Vernal Equinox – Southern Hemisphere

(Australia, New Zealand, South America, southern Africa)

First Day of Spring?

In the Northern Hemisphere, the Vernal (Spring) Equinox marks the first day of astronomical spring. There's also another, more common definition of when the seasons start, namely meteorological definitions, which are based on average temperatures rather that astronomical events.

Topics: Astronomy, Seasons, March, September, Sun, Equinox

Astronomical Season Calculator


Vernal & Autumnal Equinox

  1. Vernal (Spring) Equinox
  2. Autumnal (Fall) Equinox
  3. March Equinox
  4. 10 Facts: March Equinox
  5. March Equinox Celebrations
  6. September Equinox
  7. 10 Facts: September Equinox
  8. September Equinox Celebrations
  9. Nearly Equal Night & Day

Equinox & Solstice Worldwide

Sunrise & Sunset Times

Winter & Summer Solstices

  1. What is the June Solstice?
  2. Facts about June Solstice
  3. What is the December Solstice?
  4. Facts about December Solstice
  5. When is the Summer Solstice?
  6. When is the Winter Solstice?
  7. June Solstice Celebrations
  8. December Solstice Celebrations

Equinox & Solstice Worldwide

The Science of Seasons

  1. What Causes Seasons?
  2. Earth's Axis Is Tilted
  3. Meteorological vs. Astronomical Seasons

Look Up Seasons

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Equinox and solstice illustration.

Equinox: Equal Day & Night?

Equinoxes don't have exactly 12 hours of day and night all over the world, like many believe. Such days do happen, but depend on the latitude of your city. more

September Equinox is considered the first day of fall in the Northern Hemisphere.

When Is Fall Equinox?

The fall (autumnal) equinox in the Northern Hemisphere is in September. In the Southern Hemisphere, it's in March. more

illustration of Earth's position in relation to the Sun's rays at the September equinox

September Equinox

The Sun shines directly at the Equator on the September equinox and the length of day and night is nearly equal, but not quite. more